It has some basic writing when you first install and drag a folder into it, it's a quick explanation of how to work it , just click Got It! and it's gone.
It scans folders very quickly and has good navigation, if you want to hi-light and area just click on left column in the list and there you go, no need to clutter the map with names then. Works for me.
The duplicate scan can take longer depending on the size of the folder but all in all it's very easy to use and get around.
WARNING I accidentally clicked the delete permanently and guess what, no warning or question it truly does just delete permanently. Luckily for me I try this on pre made folders with nonsense content first. This could lead to someone to accidentally delete something important and I feel they need to at least set up an "ARE YOU SURE YOU WANT TO PERMANENTLY DELETE THIS?" pop up. It's just too easy to click it accidentally like I said.
With that fixed I'd give this an easy 5.
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